CN220704780U

CN220704780U - Rigidity-variable steel structure node

Info

Publication number: CN220704780U
Application number: CN202321992322.XU
Authority: CN
Inventors: 姚根圣; 杨雷; 金崎; 王四喜; 姚丹; 沈德阳
Original assignee: Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Current assignee: Shanghai Tunnel Engineering and Rail Transit Design and Research Institute
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-04-02
Anticipated expiration: 2033-07-27

Abstract

The utility model discloses a variable-rigidity steel structure node which is arranged between a concrete buttress and a steel member. The utility model has the advantages that: the device is used in a steel structure to realize the rotation of a steel structure node, the rotation rigidity of the node is variable through different combinations of the disc springs, and when the rigidity of the disc spring group is extremely low, the node can be considered to be in a hinged state; the arrangement of the guide side wall can further control the unidirectional rotation or the bidirectional rotation of the node.

Description

Rigidity-variable steel structure node

Technical Field

The utility model relates to the technical field of steel structures, in particular to a variable-rigidity steel structure node.

Background

In steel structures, the connection between the steel structure and the concrete piers is usually in 3 forms, flexible connection (also called as a relatively connection), rigid connection and variable stiffness connection. Wherein, the rigid connection means not rotating at all, and the flexible connection (hinge) means freely rotating. While a variable stiffness connection is a form of connection between a flexible connection and a rigid connection.

The rigidity-variable support is stressed greatly relative to the flexibly connected hinged support; the support is less stressed than a rigidly connected consolidated support, between them.

Thus, it is highly desirable for those skilled in the art how to achieve a variable stiffness of the mount.

Disclosure of Invention

According to the defects of the prior art, the utility model provides the variable-rigidity steel structure node, the variable-rigidity steel structure node realizes the variable rotation rigidity of the node by adopting different combinations of disc springs, and the unidirectional rotation or the bidirectional rotation of the node is controlled by the arrangement of the guide side wall.

The utility model is realized by the following technical scheme:

the utility model provides a become rigidity steel construction node, sets up between concrete buttress and steel component, its characterized in that become rigidity steel construction node includes built-in fitting, cushion, bolt and disc spring group, the built-in fitting is located the top surface of concrete buttress, the cushion set up in the built-in fitting with between the steel component, the screw rod head end of bolt pre-buried in the concrete buttress, the link of screw rod protrusion in the built-in fitting and extend into in the steel component, be equipped with on the screw rod link of bolt disc spring group and fasten through the nut.

Four preformed holes are formed in the embedded part for the screw rods of the bolts to pass through, and the number of the bolts corresponds to the number of the preformed holes.

The embedded part comprises a steel member, wherein the steel member is arranged on the bottom of the steel member, guide side walls are arranged on two sides of the embedded part, the bottom edges of the guide side walls are welded on the embedded part, and the inner side wall surfaces of the guide side walls are attached to the bottom of the steel member to form guide limiting.

The disc spring group is formed by combining a plurality of disc springs, and each disc spring is combined in a parallel or serial mode.

The utility model has the advantages that: the device is used in a steel structure to realize the rotation of a steel structure node, the rotation rigidity of the node is variable through different combinations of the disc springs, and when the rigidity of the disc spring group is extremely low, the node can be considered to be in a hinged state; the arrangement of the guide side wall can further control the unidirectional rotation or the bidirectional rotation of the node.

Drawings

FIG. 1 is a schematic illustration of a variable stiffness steel structure node in the present utility model;

FIG. 2 is a schematic view of guide side walls arranged on two sides of an embedded part in the utility model;

FIG. 3 is a schematic view of the present utility model without guide sidewalls on the embedment;

FIG. 4 is a schematic diagram of a disc spring assembly of the present utility model in parallel;

fig. 5 is a schematic diagram of the disc spring set of the present utility model in a series configuration.

Detailed Description

The features of the present utility model and other related features are described in further detail below by way of example in conjunction with the following drawings, to facilitate understanding by those skilled in the art:

as shown in fig. 1-5, the labels in the figures are respectively: the concrete buttress 1, the steel member 2, the bolt 3, the cushion block 4, the guide side wall 5, the embedded part 6, the disc spring set 7, the nut 8 and the reserved hole 9.

Examples: as shown in fig. 1-5, this embodiment specifically relates to a variable stiffness steel structure node, the variable stiffness steel structure node is disposed between a concrete buttress 1 and a steel member 2, the variable stiffness steel structure node includes an embedded part 6, a cushion block 4, a bolt 3 and a disc spring set 7, the variable stiffness steel structure node realizes that the rotation stiffness of the node is variable by adopting different combinations of disc springs, and the node is controlled to rotate unidirectionally or bidirectionally by the arrangement of a guide side wall 5.

As shown in fig. 1-3, the embedded part 6 is a steel plate pre-embedded on the top surface of the concrete buttress 1, four reserved holes 9 are formed in the steel plate, the number of the reserved holes 9 corresponds to the number of the bolts 3, and the reserved holes 9 are distributed in a rectangular array. According to the requirement of unidirectional rotation or bidirectional rotation of the variable-rigidity steel structure node, the guiding side walls 5 are welded at the two side edges of the embedded part 6 as shown in fig. 2 so as to realize unidirectional rotation, or the guiding side walls 5 are not welded at the two side edges of the embedded part 6 as shown in fig. 3 so as to realize bidirectional rotation. As shown in fig. 2, the bottom of the steel member 2 and the guide side walls 5 on both sides are abutted against each other to form a guide.

As shown in fig. 1, the cushion block 4 is disposed between the embedded part 6 and the steel member 2, and is used for supporting the steel member 2 and enabling it to rotate, the diameter of the cushion block 4 is selected smaller, as shown in fig. 2 or 3, and the cushion block 4 is disposed on the embedded part 6 and is disposed between the preformed holes 9.

As shown in fig. 1, 4 and 5, the head end of the bolt 3 is embedded in the concrete buttress 1, the connecting end of the bolt penetrates through the preformed hole 9 on the embedded part 6 and extends into the steel member 2, and the disc spring set 7 is assembled on the connecting end of the bolt 3 and fastened by the nut 8, so that the disc spring set 7 is clamped between the nut 8 and the bottom surface of the steel member 2. The disc spring set 7 may take the form of a parallel connection as shown in fig. 4 or a series connection as shown in fig. 5. By changing the specification of the single disc springs and the combination form of the disc springs, the number of the disc springs is changed to change the rotational rigidity of the node, so that the node rigidity is changeable. The change of the rotation rigidity of the node along with the rotation angle can be approximately considered as linear change, meanwhile, the rotation quantity of the node depends on the deformation capacity of the disc spring set 7, and in practical engineering, in order to ensure the long-term effectiveness of the node, the rotation angle of the node under various working conditions is required to be not more than 0.8 times of the deformation capacity of the disc spring set 7.

When the bending moment value under the maximum rotation angle of the node is smaller than 0.1 times of the bending moment value just under the node, the node can be approximately regarded as hinging. The stiffness formula of the disc spring set 7 is shown as follows, wherein K is the stiffness of a single disc spring, N is the number of parallel disc springs, and M is the number of series disc springs:

K _{parallel connection} ＝N·K

The theoretical formula of the rotational stiffness of the variable stiffness steel structure in this embodiment is:

wherein: l is the length of the embedded part 6, K _{Disc spring set} The rigidity of the single-side disc spring set can be obtained according to the serial-parallel connection relation of the disc spring set 7.

As shown in fig. 1-3, the design of the single/dual stiffness node in this embodiment takes into account the following principles:

(1) According to engineering actual requirements, whether the guide side wall 5 is required to be configured to realize unidirectional rotation is judged.

(2) Under the expected least adverse working condition, the rotation angle of the node is not more than 0.8 times of the deformation amount of the node disc spring group 7, and meanwhile, each component in the node area keeps an elastic state.

(3) The design of each component of the node area is specifically referred to in GB 50017-2017.

The beneficial effects of this embodiment are: the device is used in a steel structure to realize the rotation of a steel structure node, the rotation rigidity of the node is variable through different combinations of the disc springs, and when the rigidity of the disc spring group is extremely low, the node can be considered to be in a hinged state; the arrangement of the guide side wall can further control the unidirectional rotation or the bidirectional rotation of the node.

Claims

1. The utility model provides a become rigidity steel construction node, sets up between concrete buttress and steel component, its characterized in that become rigidity steel construction node includes built-in fitting, cushion, bolt and disc spring group, the built-in fitting is located the top surface of concrete buttress, the cushion set up in the built-in fitting with between the steel component, the screw rod head end of bolt pre-buried in the concrete buttress, the link of screw rod protrusion in the built-in fitting and extend into in the steel component, be equipped with on the screw rod link of bolt disc spring group and fasten through the nut.

2. The variable-rigidity steel structure node of claim 1, wherein four preformed holes are formed in the embedded part for the threaded rods of the bolts to pass through, and the number of the bolts corresponds to the number of the preformed holes.

3. The variable-rigidity steel structure node of claim 1, wherein guide side walls are arranged on two sides of the embedded part, bottom edges of the guide side walls are welded on the embedded part, and inner side wall surfaces of the guide side walls are abutted against the bottom of the steel member to form guide limit.

4. A variable stiffness steel structure joint according to claim 1, wherein the disc spring group is formed by combining a plurality of disc springs, and each disc spring is combined in a parallel or serial mode.